static FileLog()
{
var cleanupPeriod = TimeSpan.FromSeconds(5);
DefaultMuxer = new MultiFileMuxer(new SingleFileMuxerFactory());
DefaultMuxer.InitiateOrphanedRegistrationsCleanup(cleanupPeriod);
Instances = new WeakSet <FileLog>();
Instances.InitiatePurge(cleanupPeriod);
}